Strength Reliability Design of Pressure Shell Based on PDS

Abstract

The shell of scroll compressor was subjected to internal gas pressure during operation. In order to ensure the safety of the pressure shell, the structure parameters of the shell were determined initially by pressure vessel design method, and the strength of the shell was checked by finite element method. Because of the uncertainty of structural parameters, the reliability of the shell of scroll compressor was analyzed by finite element method and probability design system (PDS), and the reliability and probabilistic sensitivity of the shell were obtained. The results showed that the material’s strength, working pressure, thickness of head wall, thickness of cylinder wall, radius of cylinder and radius of head were the main factors to affect the reliability of the shell, and the reliability design method was better economic than the conventional design method. The above conclusions provide a scientific basis for the further optimal design of scroll compressor’s shell.